On secure degrees of freedom for K-user MISO broadcast channel with alternating CSIT

Leyla Sadighi, Sadaf Salehkalaibar, Stefano Rini

研究成果: Conference contribution同行評審

摘要

In this paper, the sum secure degrees of freedom (SDoF) of the K-user Multiple Input/Single Output (MISO) Broadcast Channel with Confidential Messages (BCCM) and alternating Channel State Information at the Transmitter (CSIT) is investigated. In the MISO BCCM, a K-antenna transmitter (TX) communicates toward K single-antenna receivers (RXs), so that message for RX k is kept secret from RX j with j < k. For this model, we consider the scenario in which the CSI of the RXs from 2 to K is instantaneously known at the transmitter while CSI of RX 1 is known at the transmitter (i) instantaneously for half of the time and (ii) with a unit delay for the remainder of the time. We refer to this CSIT availability as alternating CSIT. Alternating CSIT has been shown to provide synergistic gains in terms of SDoF and is thus of a viable strategy to ensure secure communication by simply relying on the CSI feedback strategy. Our main contribution is the characterization of sum SDoF for this model as SDoFsum = (2K − 1)/2. Interestingly, this SDoFsum is attained by a rather simple achievability in which the TX uses artificial noise to prevent the decoding of the message of the unintended receivers at RX 1. The proof for the case K = 3 is discussed in detail.

原文English
主出版物標題2020 IEEE Information Theory Workshop, ITW 2020
發行者Institute of Electrical and Electronics Engineers Inc.
ISBN(電子)9781728159621
DOIs
出版狀態Published - 11 4月 2021
事件2020 IEEE Information Theory Workshop, ITW 2020 - Virtual, Riva del Garda, Italy
持續時間: 11 4月 202115 4月 2021

出版系列

名字2020 IEEE Information Theory Workshop, ITW 2020

Conference

Conference2020 IEEE Information Theory Workshop, ITW 2020
國家/地區Italy
城市Virtual, Riva del Garda
期間11/04/2115/04/21

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